It makes no sense to worry about things you have no control over because there's nothing you can do about them, and why worry about things you do control? The activity of worrying keeps you immobilized.
Be a student. Stay open and willing to learn from everyone and anyone. Being a student means you have room for new input. When you are green you grow, when you are ripe you rot. By staying green you will avoid the curse of being an expert. When you know in your heart that every single person you encounter in your lifetime has something to teach you, you are able to utilize their offerings in a profound way.